Question

on
7. Write scientific reasons.
a. Atomic radius goes on decreasing
while going from left to right in a
period.
b. Metallic character
goes
decreasing while going from left to
right in a period.
c. Atomic radius goes on increasing
down a group
d. Elements belonging to the same
group have the same valency.
e. The third period contains only eight
elements even through the electron capacity of the third shell is 18​

Answer 1

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Answer 2

Answer:

Explanation:

(i) Atomic radius is the distance between the centre

of the atom to its outermost shell.

(ii) New shells are added to the atoms of the elements

as we go down from top to bottom in a group.

(iii) The outermost electrons go further and further

away from the nucleus, extending the radius and

ultimately increase in the size of the atom. Hence,

atomic radius goes on increasing down a group